Agusta A119 N928KR

Summary

On 19 July 2004 at about 23:34 local time, a Agusta A119 registered N928KR, operated by Agusta Aerospace Corp, was involved in an accident near Big Bear City, California, United States. 7 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

19 July 2004 at 23:34

Classification

Accident

Location

Big Bear City, California, United States

Coordinates

34.0869, -116.8458

Aircraft

Agusta A119

Registration

N928KR

Category

Helicopter

Engines

1

Operator

Agusta Aerospace Corp

Operating rule

Part 91: General Aviation

Purpose of flight

Other Work Use

Phase of flight

Not recorded

Route

Rialto → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX04LA273

Nobody was injured.

the pilot-passenger's failure to maintain an adequate airspeed above translational lift and to maintain adequate main rotor rpm while performing a maneuvering turn under high density altitude conditions and over high mountainous terrain, which resulted in an uncontrolled descent. Also causal was the pilot-in-command's inadequate supervision of the pilot-passenger and his delayed initiation of remedial action.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

While maneuvering during an intentional low altitude and low airspeed flight over upsloping high mountainous terrain, the helicopter lost effective translational lift while turning about 50 feet above ground level and the helicopter entered an uncontrolled descent and impacted hard on the mountainside. The purpose of the sales demonstration flight was to provide the prospective buyer (county sheriff) an opportunity to evaluate the helicopter in reconnaissance type missions over mountainous terrain. To facilitate the evaluation, the demonstration pilot allowed the sheriff's pilot to fly the helicopter over a route chosen by the sheriff. The sheriff's pilot had no flying experience in the model of helicopter. The flight was unremarkable until the sheriff's pilot allowed the helicopter's main rotor speed to drop while decreasing the forward airspeed to 20 knots. The demonstration pilot did not take the controls from the sheriff's pilot in time to avert the uncontrolled descent into the 8,800-foot mean sea level terrain. At the time, the outside air temperature was about +20 degrees Celsius, and the density altitude was over 11,000 feet. According to the helicopter manufacturer's performance data for hovering out of ground effect, the helicopter was about 500 pounds too heavy to hover at this altitude at the helicopter's gross weight.

Quoted verbatim from the NTSB record.